I dont understand all the 5 star reviews!!
Dont get me wrong, this is a well written Sudoku app. But there are better ones in the App Store.
Faults:
Entering pencil marks (almost required at the "hard" and "expert" levels) is slow & tedious!
HUGE gap in difficulty between hard and expert levels. Once pencil marks are completely entered in, the hard level "solves itself" without using any "advanced" techniques. Jump to the Expert level, and advanced techniques are required, but difficult when only 6 pencil marks are shown at a time.
Allowing mistakes encourages a kind of cheating... I have over 50 expert wins, but when Ive been in a hurry, I just guess on a number where Ive narrowed the possibilities down to 2 numbers... If Im wrong, I get a mistake, but I now know the correct number, and its usually enough to finish the puzzle with a "perfect" score...
I keep this on my iPad because its a great Sudoku for beginners, and my kids like the interface. But I will move on to other better apps.
Pharoah808 about
▻Sudoku +, v4.6